Knife for vamp-trimming machines



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9 v I vJL B: HADAWAY KNIFE FOR VAMP TRIMMING MACHINES Filed Nov. 11 1918 Patented Get. 21,

UNITED STATES PATENT OFFICE. I

:romv IB. HADAWAY, or swerrrsoorr, MASSACHUSETTS, ASSIGNOR roum'rnn siioia MACHINERY ooaronarron, or rarnnsou, new JERSEY, A CORPORATION on NEW JERSEY.

KNIFE FOR VAIVIP-TRIMMING MACHINES.

Application filed November 11, 1918. Serial No. 261,989. 7

To all whom it may concern:

Be it known that 1, JOHN B. HADAWAY, a citizen of the United States, residing at Swampscott, in the county of Essex and State of Massachusetts, have invented cert ain new and useful improvements in Knives for Vamp-Trimming Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to knives for use in vamp trimming machines and is intended primarily as an improvement in the form of vibrating trimming knife used in the machine disclosed in patent to Had-away, No. 922,697, dated May 25, 1909.

The object of the invention is to provide a knife for use in vamp trimming machines of such construction that hard and tough stock can be cut more readily and with less danger of displacing the knife in its holder than with knives at present in use and, at the same time, the knife may be of suiiicient strength to perform the work for which it is designed without liability of breakage.

With the above object in view the present invention consists in the vamp trimming knife having the improved construction hereinafter described and claimed.

The present invention will be clearly understood from an inspection of the accompanying drawings in which Figure 1 is a vertical sectional view of a vamp trimming machine provided with a vibrating vamp trimming knife constructed in accordance with the present invention; Fig. 2 is a detail sectional plan view illustrating the relation of the vibrating vamp trimming knife to the vamp lifting and guiding roll; Fig. 3 is a detail perspective view of the improved vamp trimming knife removed from the ma chine; and Fig. 1 is a detail sectional view of the vamp trimming knife taken on the line H of Fig. 2.

With the exception of the vibrating vamp trimming knife, the machine illustrated in Figure 1 is the same in the construction, arrangement and operation of its various parts as the machine illustrated in the patent to Hadaway, No. 922,697, 1 indicating the vamp lifting and guiding roll, 2 the vertical shaft at the lower end of which the roll 1 is secured, 3 and 41 the spiral gears through which a continuous rotary movement is imparted to the shaft 2 and roll 1, 5 the vibrating vamp bending device, and 6 the vibrating carrier for the vibrating va'mp trimming knife which works across the top of the roll 1 and cooperates with said roll to trim the vamp and lining of the shoe.

The novel knife shown by the drawings comprises a blade 7 having a'shank portion 8, a cutting portion 9 adjoining the portion 8, a reinforcing rib portion 14 adjoining the shank portion and one edge of the cutting portion, and a finger 10 forming an extension of the reinforcing rib portion 14. The cutting portion 9 is relatively thin compared to the other parts of the blade and is therefore adapted to sever the materials, particularly the thick bunches of toe-stiffening material, with relatively little reaction tending to spring the blade. Since this blade is arranged to cooperate, as one member of a shearing couple, with the roll 1, it is necessary to keep it in true shearing re lation to the roll for any considerable downward springing would result in fouling the roll, while upward springing would result in ragged cutting.

The blade is designed to be used in a machine of the type shown in the aforesaid Hadaway patent, which machine includes an oscillatory blade-holder 6 formed with a dovetailed clamp to lit the shank portion 8. The blade is therefore made of a plate and curved to conform to its arc of movement. It is preferably of uniform thickness, except its cutting portion 9 which is reduced as shown and for the reason explained. A straight chisel-shaped cutting edge is formed by the peripheral surface 15 and a ground face 11. An additional advantage of reducing the thickness of the cutting portion 9 is that less grinding is required to sharpen the knife.

The finger 10, which is curved to the same are as the other parts of the blade, cooperates with a stationary guide 12 as shown in the above-mentioned patent, to brace the blade against springing.

If further reinforcement of the cutting portion 9 is desired it may be obtained by forming a rib 13 on the edge opposite the rib l4, and such additional reinforcement would not perceptibly increase the resistance to the severing action of the knife.

The nature and scope of the present invention having been indicated, and a preferred embodiment of the invention having been specifically described, what is claimed is:

1. A knife for vamp-trimming machines, consisting of an arcuate plate having a chisel-shaped blade portion, a relatively thick strengthening rib extending along one side edge thereof, and a portion projecting beyond the cutting edge of the blade portion and forming an extension of said rib to run on a stress-sustaining part of the machine.

2. A knife for vamp trimming machines 7 consisting of a shank portion adapted to be secured in a holder, a cutting blade of reduced thickness as compared with the shank portion extending forwardly from the shank portion and provided with a cutting edge extending across the end of the blade, a projection integral with the shank and blade extending forwardly at one side of the blade beyond the cutting edge of the blade, and a strengthening rib at the opposite side of the blade.

3. A knife blade having a cutting portion, a shank portion, a reinforcing rib portion adjoining said shank portion and one edge of said cutting portion, and a finger forming an extension of said reinforcing portion, said cutting portion being relatively thin in comparison to said reinforcing portion and having a straight cutting-edge.

4. A knife blade having a relatively thick I portion of uniform thickness including a shank portion at one'end, a pro ecting finger portion at the other end, and a rib portion connecting said shank portion and said 7 finger portion, and a relatively thin cutting portion adjoining said shank portion and said rib portion.

JOHN B. HADAWAY. 

